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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c302ed9b27c0d7cdfb9c97163c5f04866df8b979f58bfd9718c41c51e1709fa8' 
  AND token = 'bD8Qio70e7hn4tGdQJ9qZ4/rQ9WSWxEubuDi6eAubes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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