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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebde614f204c7f0ad03c2619b302e5c006a8799e45cf2eb2823469d4114b46c8' 
  AND token = 'lBJ8f2+CUep2ytMYAf7bS6MQTQneIlGyc6ACryjYGPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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