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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c144c436dcf4be3b9c7c3cf1948668fdc3e2e8c8fd2652388b0a21e8aa8f71' 
  AND token = '1ojwJ504cq5Tk1SQhr8MHtzbHQ57N/LEviThhx++N+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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