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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e26fe2983877b08987a8fb76d13dbeb5c9151b00164a825d4a8cd0908be0481' 
  AND token = 'UkXDM9RjeU1AKSaU0/otAuaStDk8VcaLa4ogyvWwN2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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