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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4e62e8551f43e6484fd825e80b01fdd31ca3bd2d1f33d22d76f8d9fd81868f' 
  AND token = '/ppSoHk3c/HRVN8G15TsU73wbIOKfHRfwodz0vQQre0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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