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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40b5661cd0a7e25119e26c93cbbcc22c08dcc0651df092ee0e91b1ff9dd95ce' 
  AND token = 'yy4rBZNcNk56PVDFpWhytuyrwqk5J3qPalOI2n/suHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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