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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2079af0579c0bfcf433c3f87d44f5c5c89028a079a09ac35af4f7caa317438' 
  AND token = 'N8SRxOTu+ZrVnAxTsmOz+g1aJ0GGXpSm1QC986VZSS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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