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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13f42c078e1d20d2c4d8bca51c6e52a52f23cec093dde687fb797064786bd6d' 
  AND token = 'uMLlcHK9XI73XeWhJ2K8jsfRINce+tIETY0PjXDOekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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