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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc556cf617538b03210f758cb6cc34e4116fd72bab1d0e4f7e2e69f6d44c333a' 
  AND token = 'tKWJPDuIQt34MzpPSSa+aBb+bDfnxTIAOJ87HkJtyyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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