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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9d07e911930aed62d92e932bec2d5e7dd186cf952e5399bd92967753df27e4' 
  AND token = '21+4WK24LUf/IqMPQkEbhYdi9H+DokTI2znmzAiala8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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