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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874cda11fb85bdd174a2b02a1e26d0687150ac04924e1837bb4573eccf762733' 
  AND token = 'uu41Ifeannp0vZa4bLGdbr/93OUyqjtuT+WAJRyvRXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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