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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e191e608ad2fd596e3d6875919929c9a3e259526951c94a2cdb085b8d326b34' 
  AND token = 'zz6Ej58Gx2fT95Q7xzan0OtxpZV3PZBxDcyhMRUd+Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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