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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc35894f9a2f99d3db9ee615af51bb26b3c6e51bd94f23c76e4649d5bc93e4d3' 
  AND token = '5pvdtPZlzAnUs6Yvmuk86MPNcGKL3NPgRjo7FxUFHaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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