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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca19e4234b07b9a68fa65c5a95ac22c7ec4ebc0ccf0929639f5bcd8847c023c' 
  AND token = 'rpBSRRzGXhwMQ/GMUUBgRYAEPdGNnD3dXzA0RQ0BLf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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