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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f9ba4d096ec52d5d2954270ed3b23b9db29285726c4f25e4859faf714799be' 
  AND token = 'boyxTx8b6wCZkGmN5Abgdq9neXoLMeWBkzoTBF95lO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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