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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa7df93f104ef075243c38d7972ffecdc34ae259a332c6714c9b6ed680c0881' 
  AND token = 'Ahr47u3EhzTtvkP3JF+VCw0z0/qMOD9jh83yhO0aMmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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