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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8131ac1270ea4a8d8c2b26c112914231807905014964aec0984c310b1e6e62f' 
  AND token = 'o3/F3KraiR0A4sM2ens5bkab/ED0vZaMsCufjRDifu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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