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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1507572bc0a2b2fc730c61638c6f0dc7363092f78976b0b14239283e692df0dd' 
  AND token = 'FQuz4j3bJ4PuRLRONldMglNxx718ZzTZ7NQpGzcpi2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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