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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed3f094c4fc2474e9727ddb271edc4dd2350b8c34d2fb726977840f4ec958fa' 
  AND token = 'HQvi3NjYZIH0YFEyAJF6SUE62itOb1HF++JpXFE2X/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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