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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3f0eac1687346d6f7e710ca52f237883b7ec8f23f3f98b53f75ab88d3ec05d' 
  AND token = '50bC/cXUEmiQ6t440gHrcV07gTdz/rST2OLzT/EBjnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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