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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b394deaae73c8a0e71ed01a34c1d5b3431d9ea86f977a6a2a9b2f05c1a1d86b' 
  AND token = 'ORG5kUkgxxte2DZfuULxsHgOFW92zXksooshhUVTObs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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