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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce3150e67b3acaedeee181ef013dd1b28b6e390cd4f3192f929b958757abd2c' 
  AND token = '1v2HbW1bQKUVuh9o14IGoID4+U80Ny3uvdGYxtOvFCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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