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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b96aa4df74ea6236c5287ab08520ae7ad6b724f42fd387ecd23802b4416ab3' 
  AND token = 'mdtUvq7Z3KNDS8J6c99l8FRTMBm1dSIbEfw8heh2A0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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