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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21784d197bf93d81e2ab58cd784bfb4f79f9944c97c8ae2f119b642dfdf88c38' 
  AND token = 'n4rtmqtvf/Sglm+q3QAiM6j9t/jporCuTe1WNavCBKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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