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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb2de72f40f3c541a1fe5ffb7c25991e77efdb38854af7b56288f73de722936' 
  AND token = 'WOI7ZY9HcNHkf5Nn3Lei9/l7EMqDsGCVC92DlKL2l5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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