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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331119348f7c002d2c76ed0f022f6b6bf8f78cdd3a186d720c1d501b6ccf7217' 
  AND token = 'H27RtGCDXhj53UAcia0SRssA1LD2hJQzUxVmH6YFc88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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