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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089de36a5bff228e82071c40ed428b5ee753f22c53eb7464cfc21ed6e07ec1a1' 
  AND token = 'xoyUCM7YR4cFkVqfjUSEzssvL+oV8U/Bb/GXGkbE80Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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