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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c176a9eb319395fb3a7e27c9f2930c87f6aa79f0da8c7269e8c9a6b0ecb3234e' 
  AND token = '22s9XEwKuOqG9UnINPPU4vipGG7aM6BDqE3MCeOKRRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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