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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe51d78657a7a270aa1cb4aa28d56a69884404045d8b3e4896260cfd56f0a3d0' 
  AND token = '0wbi7uu0pNuIeaKUoEo/363sHR3U2QGiBMLvRMdjU58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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