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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8848ba12f4c367055d926ea3e798767271ab3a6ce638e1631bf086b19ae824a9' 
  AND token = '5Kq90VZ6PzLEq3zydz90CdhXALvehcNQIkxdcIW7naw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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