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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca37d62b1bf6b3fbb4a82990db57128ee2144e6e9f1d8fa9fd4ebddb7a66b856' 
  AND token = 'pqTiapDV8yQZ/+aJHu1/NatBu5pj1nWSC574cCDrago=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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