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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a178224023ebaefe03de9b5ff9b34c23d6af5cd17c5a523cda310e211326f13' 
  AND token = 'k+WQJl1JyuxuojW3a1LXevlrHeXJCxwRBx+l/tvCyYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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