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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9be3071cb69750f770eac0c3001b3a694b630f452fd4883b77d5114f36f766' 
  AND token = 'rmnd2AqRV2+QRjb1XdoKAW9kdzEZBQbtAqCaT1e1xnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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