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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82862ad1351fed32729d3490d373720fbf06d9cd784184fb6e77c9cd57535182' 
  AND token = 'q8Y7ymSeOqnjOqrnCnQZrtN7+nI+E4gsjf9EhMmyzHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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