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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab311cda936d3afc200e0bc0865ff35997a713e76026b4c0c4b53836edb8cd6' 
  AND token = 'AooS8uGolVSPZ6UQLbQtZp4rNTNt2R+jHr6aPlYuBtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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