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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ba460b5e86e0006be3b70cf4805eb9766aa98c63170d6ac95abb865a3c07b7' 
  AND token = 'YqJ4WzynezNg+ohEaCl02SNUjILV8gFDSf9+mizrtp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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