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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f094b53c60620b4c8f807b8e27b37e44cb235f04a9cc9f7fe92c29db5d3d10fc' 
  AND token = '8tAUH54aFi1q4ylNXVpYWkL/fh+5Y2rJWFh485tcYFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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