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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764c29656323c85a6711c7242cc431e781ae0409a5a4aa837895c7e22a7ab7fb' 
  AND token = 'wohFoVZNo0+dLw2CUEW4L6PvaRkF91f16tREUu4Le30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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