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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910eb8c2e4198fd6ecb07d23c9305ce6a49b787484ac2ca0695ac807e61de6e9' 
  AND token = 'q/q5ytT190A8bdagTD/85+5RRfbIGoKVu7ZvCVZTxY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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