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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f35b82f9c1e44f14d2f8a0e3a7916b485d8cc12babca9029b9c4f5aa150cdb1' 
  AND token = '+EZan5B0sevpH8z+3Kp0vEBeUe8TLoPHzNbQDTX7MLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}