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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058c6cd9d51ed7c772e7ddfb98ad388c7605d2838e7707a41dae54eb36ba7d00' 
  AND token = 'UfJoW9dJImFGRia/bBdjmQZk4g6VrMzEm07CVyWI6XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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