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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eacc09c2391a61dd6c31879981f01d8a827f1fa299916ff3d1790b908607a17' 
  AND token = '9IbWw6Vx02Vg21WQH7xL/hu6Eh2nNMjUVs3piJfbP0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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