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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb22e94938592dae11492f13b597ed154c238327b8ff5699669d39c3c2c57d0' 
  AND token = '8Mr60kVriPMDgEDAeOuKrxqheZWq6PDC/LQVi0lpY5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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