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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feee68fa30780d50766582e2d240168de1d810197a4277b6b8a616b2e3c7aceb' 
  AND token = 'qs7vUl2IS0Y4CoTC/zUnjYAL6ilVN7Q/iK8Csx871DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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