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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fc47108a30c7571203c212fa4844719bf9d03a41eee23380d2107f1f4e2786' 
  AND token = 'ocY4pgtB6ooq4CnBTsnJJclDrUWiyxfOZzE0BwJVMng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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