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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49bb62634f432bcb97b262ab30c3bcf8112d5b81435ee27e3763711d00f19788' 
  AND token = '0kcZhYUyp6yGNsZtCMqRuCPM4+8TCGznMq6maGrM+5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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