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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce79147f8be838b1c84b63a6f6004ae1a62d8baeae1fa66e745e092652b6b7f' 
  AND token = 'q7J7bx3wP+kA2aWaYhvRacbmXSPDOGtp1Lnu+/Q5Kfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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