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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56374dd0cdb160e7fb0b5ec4910b12208a7edc01a57781f034154f86e2ca2667' 
  AND token = '9Td6KSOjByl5bWN9zlwFkzGSCVbUWL5dgVVL5Yq6Ueo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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